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1. At 25°C, a 0.500 M solution of ammonia (NH) is 2.50% dissociated. Calculate the pH. 2. Calculate the percent dissociation of a 0.20 mol/L solution of the weak acid HNO₂ if the pH of the solution is 5.10. 3. Calculate the percent dissociation of a 3.1 x 10 mol/L solution of the weak acid, HA, if the pH of the solution is 6.10. 4. Calculate the K, of a general weak acid, HA, if a 0.500 M solution has a pH of 3.300.
5. A 0.75 M solution of weak base has a pH of 11.00. Find the Ks. 6. A solution having a pH of 9.00 contains 0.20 M of fluoriddion (F) which is a weak base. Find the Ks of fluoride ion. 7. What is the equilibrium concentration of a hypochlorous acid (HCIO) solution with K, - 3.0 x 10 if the pH is 4.10? 8. Acetate ion, CH₂COO, has a concentration of 2.0 M. Its Ks is 7.7 x 10³. What is the pH?
9. Lactic acid, HC3H5O3(aq), is a weak acid that gives yogurt its sour taste. Calculate the pH of a 0.0010 M solution of lactic acid. The K, for lactic acid is 1.4 x 104. I 10. Ascorbic acid, HC6H₂O6(a), is a weak organic acid, also known as vitamin C. A student prepares a 0.20 M aqueous solution of ascorbic acid, and measures its pH as 2.40. Calculate the K, of ascorbic acid.